Ab add11
The Ab add11 chord consists of the Ab (Perfect unison), C (Major third), Eb (Perfect fifth) and Db (Perfect eleventh) notes.

How to play the Ab add11 chord
- Find Ab (Root) on the piano keyboard
- Add C (Major third) — 4 semitones above Ab
- Add Eb (Perfect fifth) — 7 semitones above Ab
- Add Db (Perfect eleventh) — 17 semitones above Ab
- Press all 4 notes simultaneously to sound the Ab add11 chord